Wireless LAN System, Wireless LAN Terminal and Base Station Searching Method for Such System and Terminal

1. A wireless LAN system comprising: a wireless LAN terminal; and a wireless LAN base station with which the wireless LAN terminal is currently connected, wherein the wireless LAN terminal: determines that an intensity or communication quality of a signal transmitted from said wireless LAN base station and received at said wireless LAN terminal falls below a threshold; in response to determining that the intensity or communication quality of the signal has fallen below the threshold, searches for and locating a number of wireless LAN base stations with which said wireless LAN terminal is able to communicate, the number of wireless LAN base stations including said wireless LAN base station; changes the threshold in accordance with the number of wireless LAN base stations that have been located, wherein the number of wireless LAN base stations are switching candidates to which to switch connection by said wireless LAN terminal from said wireless LAN base station.

2. A wireless LAN terminal comprising: a wireless transceiver by which the wireless LAN terminal is currently connected with a wireless LAN base station; and logic implemented at least in hardware to: determine that an intensity or communication quality of a signal transmitted from said wireless LAN base station and received at said wireless LAN terminal falls below a threshold; in response to determining that the intensity or communication quality of the signal has fallen below the threshold, search for and locate a number of wireless LAN base stations with which said wireless LAN terminal is able to communication, the number of wireless LAN base stations including said wireless LAN base station; change the threshold in accordance with the number of wireless LAN base stations that have been located, wherein the number of wireless LAN base stations are switching candidates to which to switch connection by said wireless LAN terminal from said wireless LAN base station.

3. A method comprising: connecting by a wireless LAN terminal to a wireless LAN base station; determining by the wireless LAN terminal that an intensity or communication quality of a signal transmitted from the wireless LAN base station and received at the wireless LAN terminal is less than a threshold; in response to determining that the intensity or communication quality of the signal is less than the threshold, searching for and locating a number of wireless LAN base stations with which the wireless LAN base station is able to communicate, the number of wireless LAN base stations including the wireless LAN base station; changing the threshold in accordance with the number of wireless LAN base stations that have been located, wherein the number of wireless LAN base stations are switching candidates to which to switch connection by the wireless LAN terminal from the wireless LAN base station.

4. The method of claim 3 , wherein the threshold is changed linearly with the number of wireless LAN base stations that have been located.

5. The method of claim 3 , wherein the threshold is changed in a stair-step manner with the number of wireless LAN base stations that have been located.

6. The method of claim 3 , further comprising: selecting, by the wireless LAN terminal, a new wireless LAN base station to which to connect, from the number of wireless LAN base stations other than the wireless LAN base station to which the wireless LAN terminal is currently connected; disconnecting, by the wireless LAN terminal, from the wireless LAN base station to which the wireless LAN terminal is currently connected; and connecting, by the wireless LAN terminal, to the new wireless LAN base station that has been selected.